Altimeter calibration method and system based on calibration stars

By deploying calibration stars between the altimeter and the ground target, and using a calibrator to separate errors, the problems of difficult calibration field location and error coupling in traditional calibration methods are solved, thus achieving high-precision calibration of the altimeter.

CN117169836BActive Publication Date: 2026-08-25UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Application Number
CN202311350133.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-18
Publication Date
2026-08-25
Estimated Expiration
2043-10-18

AI Technical Summary

Technical Problem

Traditional calibration methods for spaceborne altimeters rely on surface calibration fields and atmospheric attenuation models, which suffer from difficulties in selecting calibration field locations, shrinkage of natural calibration fields, frequency band limitations, and error coupling issues, making it difficult to improve calibration accuracy.

Method used

A calibration satellite is deployed between the altimeter and the ground target. The onboard calibrator modulates and forwards the pulses emitted by the altimeter. The high-precision calibration factor is calculated through the echo of the calibration satellite to complete the altimeter calibration to the ground and separate system error from atmospheric error.

Benefits of technology

It achieves high-precision calibration of altimeter, reduces dependence on surface calibration fields, reduces the impact of systematic and atmospheric errors, and improves calibration accuracy.

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Abstract

The application discloses a calibrator star-based altimeter calibration system and method, which utilizes a calibrator star carrying a calibrator to correct the system error of a spaceborne radar altimeter, thereby completing the calibration of the altimeter to the earth. The calibrator can modulate and retransmit the pulse emitted by the altimeter, and the calibration factor can be calculated according to the echo of the calibrator without relying on the ground calibration field, and then the calibration task can be completed by substituting into the ground target echo equation. The method utilizes the calibrator star to convert the calibration task from the original single "air-ground" data acquisition to an integrated calibration system of "altimeter-load platform-ground target", and the calibrator is moved from the ground to the space, so that the ground clutter can be reduced or even eliminated, the system error and the atmospheric error can be separated, and the coupling problem of the system error and the atmospheric error can be indirectly completed.
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